//Earl Justin Caseres & Ralph keant Laurel

​

using System;

public class Program

{

    public static void Main()

    {

        string mySentence;

        Console.WriteLine("Input a string: ");

        mySentence=Console.ReadLine();

        mySentence=mySentence.ToLower();

        mySentence=mySentence.Replace(" ","");

        mySentence=mySentence.Trim();

        int b;

        for(int a=0; a<mySentence.Length;a--)

        {

            Console.WriteLine(mySentence);

            string sub=mySentence.Substring(0,1);

            b=mySentence.IndexOf(sub);

            int counter=0;

            while(b != -1)

            {

                counter++;

                b=mySentence.IndexOf(sub,a +1);

            }

            Console.WriteLine("{0} - {1}",sub,counter);

            mySentence=mySentence.Replace(sub,"");

        }

    }

}